This is from the epic thread over on Accurate Reloading forums - I take absolutely zero credit for Michael's work by posting this. It is just an interesting perspective:

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FWIW I just tested the 185gr TTSX and 250gr Partition into a large spruce round (lengthwise) at 200 yards. The 185 TTSX hardly expanded at all. It penetrated ~50% further than the Partition, but the damage channel was very small compared to the Partition. I can post pictures if anyone cares to see.